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Date: Mon, 21 Jul 2003 21:20:38 +1000
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Subject: [acpi-jp 2479] Re: acpi and cpu performance states
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On Sun, Jul 20, 2003 at 03:45:55PM -0700, Nate Lawson wrote:
> When I boot my laptop on acline, everything works normally.  When I unplug
> the AC adapter, I get the offline event and the cpu drops back to a slower
> speed (verified by benchmarks).  When I go back online, the performance
> goes right back to its normal speed.
On a related note, as I've reported (and at least someone else has confirmed) 
cpu throttling doesn't work properly on some laptops. At least on my
presario 720, even though I get the profile changed messages, the cpu
speed itself is unchanged (according to x86info) when going from batt <-> ac,
whether I boot off ac or not. Furthermore, I actually have to look at
the sysctls, or run apm to get freebsd to notice that something's
changed (I suppose something's not being tickled until I do this)
